@All @all, who here gets paid to do crypto?

@back_seat_driver I get paid to do engineering work (and management of that) in a field that uses crypto (Smart Cards).

Hey @SEJPM

I have written a program but I get wrong values of $f+hq$. Can I show it to show? Maybe you have an idea where my error is. @SEJPM

@e-sushi You are waiting for Monday? :P

@Evinda Well, you can show me, but I can't guarantee that I will actually be useful

@Evinda usually a simple ring tends to be the best choice (something like the polynomials over Z_2)

@SEJPM I thought to pick the ring Z_p

pastebin.com/K2hTD5iv @SEJPM

@back_seat_driver as well as fgrieu, also maarten, yehuda, curves, biv, thomas pornin, maybe mikeazo, poncho, samuel neves,....

We don't get that f+h*q remains unaltered. Have I done a mistake with the indices of f, h and q? @SEJPM

@Evinda I'm not sure, do you actually implement the addition and the multiplication as polynomial arithmetic?

Is there maybe an error at the indices? @SEJPM

@SqueamishOssifrage you wanna chime in? :p

@SEJPM Hi! What's the problem? What are you trying to do? What did you input, what did you see as output, and what did you expect to see as output?

I tried to implement the algorithm in C in order to show that f+hq remains unaltered, but I didn't achieve to show this.

That's the program I wrote: pastebin.com/K2hTD5iv

And that is what we get a specific example

And I think that the error lies at this command: printf("f[%d]+h[%d]*q[%d]=%d \n",j,j-(i-d2),i-d2,f[j]+h[j-(i-d2)]*q[i-d2] );

Do you have an idea? @SqueamishOssifrage